.book_data {
    width: 1100px;
    padding: 20px 50px;
    margin: auto;
    /*border: 1px solid #000;*/
}


/* .hover {
	background-color: #E2E2E2;
	border-top-left-radius: 20px;
	border-top-right-radius: 20px;
} */

.left {
    float: left;
    width: 130px;
    text-align: center;
    background-color: #f5f5f5;
    /*border: 1px solid #f5f5f5;*/
    /* border-radius: 20px; */
}

.left li {
    line-height: 48px;
    cursor: pointer;
}

.right li:hover {
    background-color: #E2E2E2;
}

.right {
    float: right;
    width: 900px;
}

.right li {
    float: left;
    width: 160px;
    height: 66px;
    line-height: 66px;
    margin-right: 20px;
    cursor: pointer;
}

.right img {
    width: 32px;
    height: 32px;
    margin: 16px 10px 0 0;
    /*vertical-align 垂直对齐，它只针对于**行内元素**或者**行内块元素**，*/
    vertical-align: top;
}